<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.demo {
				clip-path: polygon(100% 0, 75% 100%, 25% 100%, 0 0);
			}
		</style>
	</head>
	<body>

		<div class="demo" style="width: 300px; height: 300px; margin: auto; background: red;">
		</div>
	</body>
</html>
